You can entertain yourself with anything and everything as long as you don't cross the limits which Allah and His messenger(PBUH) have set.
You can do sports , go on a picnic, make family gatherings , sit with your friends on a study circle, etc etc
Always remember no matter what you do , you never follow the footsteps of shaitaan
When I read your question the first thing which came into my mind was that Hadeeth where Prophet (PBUH) joined Aysha (Radh) when she wanted to watch a show !
I can remember on which book it was recorded,
If anyone could find that hadeeth , and paste it here; that would be nice Insha Allah
In this video Brother Abdel Rahman explains that hadeeth , for the time being go through this until someone come up with the hadeeth along with the reference Insha Allah
(The title seems off the topic, still the content is relevant to your question)